Bulgarian Ship Hydrodynamics Centre
- Conducts research in ship and offshore hydrodynamics, coastal hydraulics, aerodynamics, environment, water transport and information technology.
- http://www.bshc.bg/

Bulgarian Academy of Sciences
- Board, central administration and research units.
- http://www.cu.bas.bg/

Wide Field Plate Database
- Contains the descriptive information for the astronomical wide-field (>1°) photographic observations stored in numerous archives all over the world.
- http://www.wfpa.bas.bg/

IEEE Bulgaria
- Regional section of the institute of electrical and electronics engineers.
- http://www.ieee.bg/